Answer:

Step-by-step explanation:
Given



Required
Calculate the hourly rate
First, we will determine the amount of ice cream that was sold


Next, calculate the average hourly rate:






-- Approximated
Answer:
The regression line is not an appropriate model due to the existence of a pattern in the residual plot.
Step-by-step explanation:
A residual plot has been provided for a certain data set.
The residual plot indicates a scatter relationship between x and y.
The plotted points demonstrate that a linear relation is unlikely; it appears to be more parabolic or exponential in nature.
This suggests the regression line is not a suitable model as the residuals do not converge towards 0.
Additionally, a linear trend pattern is absent.
D) The regression line is not a suitable model as it exhibits a pattern in the residual plot.